Knife-cylinder for hide-working machines.



. J. STRYKER.

KNIFE CYLINDER FOR HIDE WORKING MACHINES.

, APPLICATION FILED AUG. 26, 1912.

Patented May 27, 1913.

filly Jac y JACOB STRYKER, OF SOMERVILLE, MASSACHUSETTS.

KNIFE-CYLINDER FOR HIDE-WORKING MACHINES.

Specification of Letters Patent.

Patented May 27, 1913.

Application filed. August 26, 1912. Serial No. 717,212.

T 0 all whom it may concern Be it known that I, JACOB STRYKER, a citizenof the United States of America, and a resident of Somerville, in thecounty of Middlesex and State of Massachusetts, have invented certainnew and useful Improvements in Knife-Cylinders for Hide-\VorkingMachines, of which the following is a specification.

This invention relates to knife cylinders and particularly to devices ofthis class adapted for use in fleshing and similar hide workingmachines.

The object of the invention is to produce a device of this class whichwill shave off a thin layer of the hide without injuring any portionthereof, producing practically the same result as is secured by handoperated tools.

The invention consists in providing a knife cylinder with certain bladeswhich tend to position and stretch the hide while other intermediateblades are peculiarly constructed in order to properly perform theshaving operation.

The invention consists in certain novel features of construction andarrangement of parts which will be fully understood by reference to thedescription of the drawings and to the claims hereinafter given.

Of the drawings: Figure 1 represents an elevation of a knife cylinderembodying the features of the present invent-ion. Fig. 2 represents atransverse section of the same. Fig. 3 represents a sectional detaildrawn to a greatly enlarged scale. Fig. 4 represents a similar viewshowing a modified form of blade, and Fig. 5 represents in diagram oneof the knife blades and showing the pitch thereof decreasing from thecenter outwardly in each direction.

Similar characters designate like parts throughout the several figuresof the draw- Tn the drawings, 10 is the body portion of the cylinderinto which is cut a plurality of helical grooves 11 extending inopposite directions from a point midway of said body portion 10. Thegrooves 11 are radial to the axis of said cylinder and their pitchdecreases gradually toward the ends of said cylinder.

Secured in the grooves 11 by means of the shims 12 are the blades 13 theedges of which are bent forward as indicated in the drawings with theiredges lying in a cylindrical surface. These blades 13 are preferablycurved forward as indicated in Fig. 3, and their edges are shaped sothat they lie in a cylindrical surface, thus leaving a cutting edge onthe front face of said blades. Interposed between the blades 13 areother blades 14: of thicker material and preferably these blades arecurved forwardly as indicated in Fig. 3. Very good results, however, maybe obtained when the blades are simply bent forward as shown in Fig. 4.The wide blades 14: bear upon the material and position it while thecutting or shaving blades 13 shave off a thin layer of the flesh. Theblades'l3 and 14 decrease in pitch from the center of the roll 10outwardly in either direction and thereby act upon the bellies of thehides to smooth them out carefully preparatory to the cutting operation.

Heretofore, when it has been attempted to shave the hides by machineryusually the bellies are injured materially and often entirely destroyed.By the use of a knife cylinder constructed as shown and described hereinthe objection is entirely overcome and the hides may be shaved ascleanly as if the operation was performed by hand.

It is believed that the operation and many advantages of the inventionwill be fully understood from the foregoing.

Having thus described my invention, I claim:

1. A knife cylinder for hide working machines consisting of acylindrical body por tion, and a plurality of helical knife blades ofalternately thin and thick material all inclined forward with theiredges in a cylindrical surface.

2. A knife cylinder for hide working machines consisting of acylindrical body portion, and a plurality of helical knife blades, everyalternate blade being of thinner material than the others andbentforward with the edges of all of said blades lying in a cylindricalsurface.

3. A knife cylinder for hide working m achines consisting of acylindrical body portion, and a plurality of helical knife blades, everyalternate blade being of thinner material than the others and curvedforward with the edges of all of said blades lying in a cylindricalsurface.

4. A knife cylinder for hide working machines consisting of acylindrical body portion, and a plurality of helical knife blades Signedby me at Boston, Mass. this 10th extending in opposite directions withtheir day of August, 1912. pitch gradually decreasing from a point midway of said body portion, every alternate JACOB STRYKER' blade being ofthinner material and bent Witnesses:

forward and the edges of all of said blades 7 EDWARD F. ALLEN,

lying in a cylindrical surface. NATHAN G. LOMBARD.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

